Long Islanders should brace for persistent rainfall this week as the remnants of Tropical Storm Chantal move up the East Coast and bring the potential of flooding, forecasters said.

The storm system, which is moving over the Carolinas Sunday, is expected to weaken as it churns toward the mid-Atlantic but will "converge together" with another front and bring moisture to Long Island, according to Newsday meteorologist Rich Von Ohlen.

"When they bump together, there will be opportunities for those tropical-type showers," said Von Ohlen.

The National Weather Service forecasts thunderstorms and showers in Nassau and Suffolk Counties after 11 a.m. Monday, followed by a chance of rain every day for the remainder of the week.

Multiple storm systems will interact with "tropical humidity" during the week to create a wide window for rain, creating the type of downpours typically seen in Florida, Von Ohlen said.

Matthew Wunsch, a meteorologist in the National Weather Service’s Upton office, said Chantal won’t linger for long but that "waves of moisture" from a system moving in from the Northwest will combine with high heat throughout the week to "bring "a chance of showers and thunderstorms pretty much every day, particularly in the afternoons."

The weather service expects highs in the mid-to-high 80s through the start of the weekend, with lows hovering in the mid-to-low 70s. 

There might be a brief lull in rainy weather on Wednesday, Wunsch said, but a new system moving in on Thursday will bring another round of precipitation.

The consistent rainfall raises the potential for localized flooding, Wunsch said.

"With the amount of moisture that's present this week, any thunderstorm or heavier shower can definitely produce torrential rain," he said, though he added widespread flooding is not currently expected.

"It’s not going to be great this week," Wunsch said.

Earlier on Sunday, the New York State Department of Environmental Conservation issued an air quality alert for the New York Metro area for high ozone levels, which is in effect until 11 p.m. The alert does not include Long Island but warns ground-level ozone — a major component of smog — could cause issues like shortness of breath, chest pain and coughing, particularly for higher-risk groups like those with asthma and other existing health conditions.